Department of Quantum Materials

Entanglement of electrons (electron correlations) in solids, in combination with details of the crystal lattice structure, produce a surprisingly rich variety of electronic phases, that are liquid, liquid-crystal and crystalline states of the charge and spin degrees of freedom. These complex electronic phases and the subtle competition among them very often give rise to novel functionality. The department will be studying these interesting novel phases in transition metal oxides and related compounds where the narrow d-bands, which give rise to strong electron correlations, in combination with the rich chemistry of such materials provides excellent opportunities for new discoveries. The goal of this research will be to hunt for new materials exhibiting exotic electronic states of matter, showing phenomena such as superconductivity or high thermoelectricity, and to explore them with advanced measurement techniques to unveil the physical mechanisms that could be drivers of potentially highly desirable functionality.


Prof.Dr. Hidenori Takagi

was awarded the Eugen and Ilse Seibold Prize of the German Research Foundation.

This prize is awarded to Japanese and German researchers in recognition of their exceptional contribution towards advancing understanding between the two countries.

<h4 class="show">A spin-orbital-entangled Quantum Liquid</h4>
An international team of scientists from Max Planck Institute for Solid State Research, University of Stuttgart, and University of Tokyo has experimentally observed an exotic quantum state of matter: a spin-orbital-entangled quantum liquid formed by iridium magnetic moments on a honeycomb lattice in the compound H3LiIr2O6. The iridium moments do not exhibit any type of magnetic ordering and remain quantum disordered down to very low temperatures compared to the strength of their pairwise interactions. Instead, the iridium moments liquefy into a highly-entangled, quantum, spin-liquid state involving not only spins but also orbital moments of iridium electrons. more
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